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- Add support for logging KTR via ALQ. This is optional and enabled by the

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KTR_ALQ config option.
This commit is contained in:
Jeff Roberson 2002-09-22 07:13:45 +00:00
parent c76e20451c
commit abee588b36
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=103787
2 changed files with 95 additions and 3 deletions
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95
sys/kern/kern_ktr.c
View File

@ -36,8 +36,10 @@
#include "opt_ddb.h"
#include "opt_ktr.h"
#include "opt_alq.h"
#include <sys/param.h>
#include <sys/alq.h>
#include <sys/cons.h>
#include <sys/kernel.h>
#include <sys/ktr.h>
@ -52,6 +54,7 @@
#include <machine/ktr.h>
#endif
#include <ddb/ddb.h>
#ifndef KTR_ENTRIES
@ -99,14 +102,79 @@ TUNABLE_INT("debug.ktr.verbose", &ktr_verbose);
SYSCTL_INT(_debug_ktr, OID_AUTO, verbose, CTLFLAG_RW, &ktr_verbose, 0, "");
#endif
#ifdef KTR_ALQ
struct alq *ktr_alq;
char ktr_alq_file[MAXPATHLEN] = "/tmp/ktr.out";
int ktr_alq_cnt = 0;
int ktr_alq_depth = KTR_ENTRIES;
int ktr_alq_enabled = 0;
int ktr_alq_failed = 0;
int ktr_alq_max = 0;
SYSCTL_INT(_debug_ktr, OID_AUTO, alq_max, CTLFLAG_RW, &ktr_alq_max, 0,
"Maximum number of entries to write");
SYSCTL_INT(_debug_ktr, OID_AUTO, alq_cnt, CTLFLAG_RD, &ktr_alq_cnt, 0,
"Current number of written entries");
SYSCTL_INT(_debug_ktr, OID_AUTO, alq_failed, CTLFLAG_RD, &ktr_alq_failed, 0,
"Number of times we overran the buffer");
SYSCTL_INT(_debug_ktr, OID_AUTO, alq_depth, CTLFLAG_RW, &ktr_alq_depth, 0,
"Number of items in the write buffer");
SYSCTL_STRING(_debug_ktr, OID_AUTO, alq_file, CTLFLAG_RW, ktr_alq_file,
sizeof(ktr_alq_file), "KTR logging file");
static int
sysctl_debug_ktr_alq_enable(SYSCTL_HANDLER_ARGS)
{
int error;
int enable;
enable = ktr_alq_enabled;
error = sysctl_handle_int(oidp, &enable, 0, req);
if (error || !req->newptr)
return (error);
if (enable) {
if (ktr_alq_enabled)
return (0);
error = suser(curthread);
if (error)
return (error);
error = alq_open(&ktr_alq, (const char *)ktr_alq_file,
sizeof(struct ktr_entry), ktr_alq_depth);
if (error == 0) {
ktr_mask &= ~KTR_ALQ_MASK;
ktr_alq_cnt = 0;
ktr_alq_failed = 0;
ktr_alq_enabled = 1;
}
} else {
if (ktr_alq_enabled == 0)
return (0);
ktr_alq_enabled = 0;
alq_close(ktr_alq);
ktr_alq = NULL;
}
return (error);
}
SYSCTL_PROC(_debug_ktr, OID_AUTO, alq_enable,
CTLTYPE_INT|CTLFLAG_RW, 0, 0, sysctl_debug_ktr_alq_enable,
"I", "Enable KTR logging");
#endif
void
ktr_tracepoint(u_int mask, const char *file, int line, const char *format,
u_long arg1, u_long arg2, u_long arg3, u_long arg4, u_long arg5,
u_long arg6)
{
struct ktr_entry *entry;
#ifdef KTR_ALQ
struct ale *ale = NULL;
#else
int newindex, saveindex;
#ifdef KTR_VERBOSE
#endif
#if defined(KTR_VERBOSE) || defined(KTR_ALQ)
struct thread *td;
#endif
int cpu;
@ -118,17 +186,33 @@ ktr_tracepoint(u_int mask, const char *file, int line, const char *format,
cpu = KTR_CPU;
if (((1 << cpu) & ktr_cpumask) == 0)
return;
#ifdef KTR_VERBOSE
#if defined(KTR_VERBOSE) || defined(KTR_ALQ)
td = curthread;
if (td->td_inktr)
return;
td->td_inktr++;
#endif
#ifdef KTR_ALQ
if (ktr_alq_enabled &&
td->td_critnest == 0 &&
(td->td_kse->ke_flags & KEF_IDLEKSE) == 0) {
if (ktr_alq_max && ktr_alq_cnt > ktr_alq_max)
goto done;
if ((ale = alq_get(ktr_alq, ALQ_NOWAIT)) == NULL) {
ktr_alq_failed++;
goto done;
}
ktr_alq_cnt++;
entry = (struct ktr_entry *)ale->ae_data;
} else
goto done;
#else
do {
saveindex = ktr_idx;
newindex = (saveindex + 1) & (KTR_ENTRIES - 1);
} while (atomic_cmpset_rel_int(&ktr_idx, saveindex, newindex) == 0);
entry = &ktr_buf[saveindex];
#endif
entry->ktr_timestamp = KTR_TIME;
entry->ktr_cpu = cpu;
entry->ktr_file = file;
@ -153,7 +237,12 @@ ktr_tracepoint(u_int mask, const char *file, int line, const char *format,
entry->ktr_parms[3] = arg4;
entry->ktr_parms[4] = arg5;
entry->ktr_parms[5] = arg6;
#ifdef KTR_VERBOSE
#ifdef KTR_ALQ
if (ale)
alq_post(ktr_alq, ale);
done:
#endif
#if defined(KTR_VERBOSE) || defined(KTR_ALQ)
td->td_inktr--;
#endif
}

3
sys/sys/ktr.h
View File

@ -92,6 +92,9 @@
#define KTR_COMPILE (KTR_GEN)
#endif
/* Trace classes that can not be used with KTR_ALQ */
#define KTR_ALQ_MASK (KTR_WITNESS)
/*
* Version number for ktr_entry struct. Increment this when you break binary
* compatibility.